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DEBT - CREDIT FACILITIES (Details) (USD $)
Mar. 31, 2014
Jan. 30, 2014
Jan. 24, 2014
Sep. 30, 2013
Line of Credit Facility [Line Items]        
Bank term loan $ 63,200,000     $ 365,600,000
NJR [Member] | Letter of Credit [Member]
        
Line of Credit Facility [Line Items]        
Letters of credit outstanding, amount 25,300,000     17,900,000
NJR [Member] | Bank Revolving Credit Facility [Member]
        
Line of Credit Facility [Line Items]        
Bank credit facilities 425,000,000 [1] 325,000,000 [1]   325,000,000 [1]
Amount available at end of period 384,459,000 [2]     210,110,000 [2]
Line of credit facility, additional borrowing capacity     50,000,000  
NJR [Member] | Bank Revolving Credit Facility [Member] | Notes Payable to Banks [Member]
        
Line of Credit Facility [Line Items]        
Amount outstanding at end of period 15,200,000     97,000,000
Weighted average interest rate at end of period 1.15%     1.00%
NJR [Member] | Bank Term Loan [Member]
        
Line of Credit Facility [Line Items]        
Amount outstanding at end of period 0     100,000,000
Weighted average interest rate at end of period 0.00%     0.74%
Amount available at end of period 100,000,000     0
Bank term loan 100,000,000 [3]     100,000,000 [3]
NJR [Member] | Bank Letter of Credit Facility [Member]
        
Line of Credit Facility [Line Items]        
Bank credit facilities 10,000,000 [3],[4]     10,000,000 [3],[4]
NJNG [Member] | Letter of Credit [Member]
        
Line of Credit Facility [Line Items]        
Letters of credit outstanding, amount 731,000     266,000
NJNG [Member] | Bank Revolving Credit Facility [Member]
        
Line of Credit Facility [Line Items]        
Bank credit facilities 250,000,000 [1]     250,000,000 [1]
Amount available at end of period 201,269,000 [5]     81,400,000 [5]
NJNG [Member] | Bank Revolving Credit Facility [Member] | Commercial Paper [Member]
        
Line of Credit Facility [Line Items]        
Amount outstanding at end of period 48,000,000     168,600,000
Weighted average interest rate at end of period 0.12%     0.13%
NJNG [Member] | Bank Credit Facility Dedicated to EDA Bonds [Member]
        
Line of Credit Facility [Line Items]        
Bank credit facilities $ 100,000,000 [1],[4]     $ 100,000,000 [1],[4]
[1] Committed credit facilities, which require commitment fees on the unused amounts.
[2] Letters of credit outstanding total $25.3 million and $17.9 million as of March 31, 2014 and September 30, 2013, respectively, which reduces amount available by the same amount.
[3] Uncommitted.
[4] There were no borrowings outstanding as of March 31, 2014 and September 30, 2013, respectively.
[5] Letters of credit outstanding total $731,000 and $266,000 as of March 31, 2014 and September 30, 2013, respectively, which reduces the amount available by the same amount.